Question: Name the type of work done by Robert Frost for which he has received award as Pulitzer Prize for Poetry?
Paraphrase: When Robert Frost won the Pulitzer Prize for Poetry, what work was it for?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q168728 p:P166 ?s . ?s ps:P166 wd:Q2117891 . ?s pq:P1686 ?value}